CBSE 2025 · Region 3 · Set 3 · Q17 · 1 mark
Assertion (A) : Brass is prepared by first melting copper and then dissolving tin into it in a definite proportion.
Reason (R) : The primary metal of brass is copper.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
Metals and Non-metalsOccurrence and Extraction of MetalsUnderstandassertion_reasonmedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.